Steel and aluminum are heavily used in the automotive and construction industry, but are also used to manufacture goods and appliances. The decision mirrors the actions Trump levied during his first Administration, when he enacted a 25% tariff on steel and 10% tariff on aluminum, though some countries, including South Korea were exempt.

China’s retaliatory tariffs against the U.S. came into effect early Monday but President Donald Trump paved the way for more levies.

Existing American tariffs already restrict steel and aluminum shipments from China, which is now flooding other markets with its exports instead.